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Finding the Fourth Proportional to 997.94, 1,376.79 and 666.58

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Solution

The fourth proportional to 997.94, 1,376.79 and 666.58 is: 919.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.94 : 1,376.79 = 666.58 : x
  2. Step 2: Convert to fraction form
    997.94/1,376.79 = 666.58/x
  3. Step 3: Cross multiply
    997.94x = 1,376.79 × 666.58
  4. Step 4: Simplify right side
    997.94x = 917,735.57
  5. Step 5: Solve for x
    x = 917,735.57/997.94
  6. Step 6: Final answer
    x = 919.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.